• The results of the study support the four-arm model of our galaxy’s structure. For the last few years, various methods of charting the Milky Way have largely led to a picture of four spiral arms. The arms are where most stars in the galaxy are born. They contain most of the galaxy’s gas and dust, the raw ingredients for new stars.
  • The new method uses what are called “embedded star clusters,” which are places shrouded by galactic dust, essentially stellar nurseries where new stars are being born.
  • Two of the arms, called Perseus and Scutum-Centaurus, seem to be more prominent and jam-packed with stars, while the Sagittarius and Outer arms have as much gas as the other two arms but not as many stars.

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